fiber optic 16 Flashcards Preview

2016 Master > fiber optic 16 > Flashcards

Flashcards in fiber optic 16 Deck (60):
1

A method used to lock and mark one end of a line in order to allow someone to safely work on the other end.

Lockout tag-out

2

A card made up of material similar to photographic film that changes colors when exposed to light.

Photosensitive card

3

Visible light is generated at the following wavelengths

Between 390 nm and 780 nm

4

Allows only a single mode of light to propagate through the fiber core. This is the most common type of fiber used in telecommunications.

single-mode fiber

5

Allows many modes of light to propagate through the core. This type of fiber has a larger core and is used only for short distance data links. The bandwidth is limited due to light dispersion.

multi-mode fiber

6

The center of the fiber that carries the transmitted light.

core

7

The glass material surrounding the fiber core. This glass has a lower refractive index and reflects the light back into the core, thus maintaining the light level over a long distance.

cladding

8

The acrylic or plastic material applied over the optical fiber core and cladding. This material protects the glass and adds to its strength.

coating

9

The ratio of the velocity of light of two mediums of optical glass.

refractive index

10

A photo diode used to detect light from an optical fiber and convert the light to an electrical source.

pin diode

11

The difference between transmitted and received power resulting from the loss through equipment, lines, or other transmission devices; usually expressed in decibels.

attenuation

12

EDFA

erbium-doped fiber amplifier

13

YEDFA

Ytterbium Erbium-doped fiber amplifier

14

Fiber Loss at 1310nm

.35 dB/km

15

Fiber Loss at 1550nm

.25 dB/km

16

How many feet in a Kilometer

3,280 ft

17

Sum of all the losses associated with a fiber link between the optical fiber transmitter and the optical fiber receiver.

loss budget

18

Fusion Splice loss (typical)

0.1 dB

19

Mechanical Splice loss (typical)

0.25 dB

20

Connector Loss

0.5 dB average

21

Convert mW to dBm

dBm = 10log(mW)

22

Convert dBm to mW

mW = 10(dB/10)

23

A jumper cable for optical connections.

pigtail

24

A board for making optical connections consisting of sleeves used to line up two connectors.

patch panel

25

Fibers are contained in a plastic tube much larger than the optical fibers. The fibers can move freely within the

loose tube

26

Color-coded tubes that house and protect the optical fibers within a fiber optic cable.

buffer tube

27

consists of larger buffer tubes with the fibers inside, surrounded by fiberglass water block tape, armor, two steel strength members, and a jacket.

Unitube

28

fibers that are arranged side by side

Ribbon

29

the process by which two pieces of glass are physically melted together

Fusion splicing

30

inserting two pieces of glass into a plastic locking sleeve, carefully aligning the fibers, and locking the pieces of fiber together

Mechanical splicing

31

Clean all gel from the buffer tubes and individual fibers with

isopropyl alcohol that is at least 90% pure.

32

how far back should you strip the fiber

1-1/2 to 2 inches

33

two ways how splice machine lines up the fiber ends in order to get the best possible splice

Local Injection and Detection (LID), and Profile Alignment

34

A device used to wrap and store excess fiber optic cable in an aerial location.

snowshoe

35

Comcast currently allows for____of loss through a fusion splice

.05 dB

36

OTDR

Optical Time Domain Reflectometer

37

Fiber connector used like a snap connector, but a twist lock feature much like a BNC RF connector.

ferruled connector

38

A rectangular plastic form used to connect optical fiber to optical devices.

snap connector

39

Fiber connector that uses an 8 to 12 degree angled cut end.

APC (Angle Polish Connector)

40

A special optical fiber connector used in gigabit Ethernet devices.

LCSC

41

LASER acronym

Light Amplification Stimulated by Emission of Radiation

42

An electronic or optical process that combines several individual signals or wavelengths into a single carrier or path.

multiplexing

43

Enables different wavelengths to be carried on a single optical fiber.

wavelength division multiplexing

44

Allows multiple wavelengths above and below a center wavelength to be carried on a single optical fiber.

DWDM (dense wave division multiplexing

45

A connection point in a cable system where a fiber enters a neighborhood and the optical signal is converted to an electrical signal

node

46

Used to detect light from an optical fiber and convert the light to an electrical source.

photodiode

47

Optical fiber with erbium, a rare earth material, added to the glass during the manufacturing process, to give the fiber useful properties when properly lased

doping

48

Used to amplify light (1550 nm). It does so by utilizing an Erbium (rare earth metal) doped fiber and a pump laser. This enables the light to travel greater distances.

EDFA (erbium-doped fiber amplifier)

49

provides an even greater gain in light than an EDFA Optical Amplifier.

YEDFA (ytterbium erbium-doped fiber amplifier)

50

Central data point communicating with endpoints of a network. All data communications must flow through the central point.

STAR

51

A network of devices connected together in a circular communication link.

ring

52

Generated during the node certification showing the fiber performance when first activated. It is a document used to compare old test results to new test results.

node birth certificate

53

The distance that cannot be seen by the OTDR because it too close to the OTDR source.

dead zone

54

Extra fiber connected to the OTDR (approximately 500 to 1,000 meters) to make up for the dead zone

launch cable

55

Device used to test the optical power. It converts the amount of light present to a dBm level.

optical power meter

56

Fiber optic measurement based on the equivalent heating power of the light. It is measured in dBm.

optical power

57

Silicon photodiodes are sensitive to light in the range of

400 to 1000 nm.

58

Most fiber optic power meters are available with a choice of three detectors

Silicon (Si), Germanium (Ge) ,Indium-Gallium-Arsenide (InGaAs).

59

A cabinet or rack that houses the splices of the outside plant fiber to the inside headend, node, or OTN fiber.

splice panel

60

(OCEF)

Optical Cable Entry Facility

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